[dpdk-dev,v2,2/5] net/qede: fix minimum buffer size and scatter Rx check
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Commit Message
From: Harish Patil <harish.patil@qlogic.com>
- Fix minimum RX buffer size to 1024B
- Force enable scatter/gather mode if given RX buf size is lesser than MTU
- Adjust RX buffer size to cache-line size with overhead included
Fixes: bec0228816c0 ("net/qede: support scatter gather")
Fixes: 2ea6f76aff40 ("qede: add core driver")
Signed-off-by: Harish Patil <harish.patil@qlogic.com>
---
drivers/net/qede/qede_ethdev.c | 3 +--
drivers/net/qede/qede_rxtx.c | 47 +++++++++++++++++-----------------------
drivers/net/qede/qede_rxtx.h | 11 ++++++++--
3 files changed, 30 insertions(+), 31 deletions(-)
@@ -969,8 +969,7 @@ qede_dev_info_get(struct rte_eth_dev *eth_dev,
PMD_INIT_FUNC_TRACE(edev);
dev_info->pci_dev = RTE_DEV_TO_PCI(eth_dev->device);
- dev_info->min_rx_bufsize = (uint32_t)(ETHER_MIN_MTU +
- QEDE_ETH_OVERHEAD);
+ dev_info->min_rx_bufsize = (uint32_t)QEDE_MIN_RX_BUFF_SIZE;
dev_info->max_rx_pktlen = (uint32_t)ETH_TX_MAX_NON_LSO_PKT_LEN;
dev_info->rx_desc_lim = qede_rx_desc_lim;
dev_info->tx_desc_lim = qede_tx_desc_lim;
@@ -89,11 +89,11 @@ qede_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
{
struct qede_dev *qdev = dev->data->dev_private;
struct ecore_dev *edev = &qdev->edev;
- struct rte_eth_dev_data *eth_data = dev->data;
+ struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
struct qede_rx_queue *rxq;
- uint16_t pkt_len = (uint16_t)dev->data->dev_conf.rxmode.max_rx_pkt_len;
+ uint16_t max_rx_pkt_len;
+ uint16_t bufsz;
size_t size;
- uint16_t data_size;
int rc;
int i;
@@ -127,34 +127,27 @@ qede_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
rxq->nb_rx_desc = nb_desc;
rxq->queue_id = queue_idx;
rxq->port_id = dev->data->port_id;
-
- /* Sanity check */
- data_size = (uint16_t)rte_pktmbuf_data_room_size(mp) -
- RTE_PKTMBUF_HEADROOM;
-
- if (pkt_len > data_size && !dev->data->scattered_rx) {
- DP_ERR(edev, "MTU %u should not exceed dataroom %u\n",
- pkt_len, data_size);
- rte_free(rxq);
- return -EINVAL;
+ max_rx_pkt_len = (uint16_t)rxmode->max_rx_pkt_len;
+ qdev->mtu = max_rx_pkt_len;
+
+ /* Fix up RX buffer size */
+ bufsz = (uint16_t)rte_pktmbuf_data_room_size(mp) - RTE_PKTMBUF_HEADROOM;
+ if ((rxmode->enable_scatter) ||
+ (max_rx_pkt_len + QEDE_ETH_OVERHEAD) > bufsz) {
+ if (!dev->data->scattered_rx) {
+ DP_INFO(edev, "Forcing scatter-gather mode\n");
+ dev->data->scattered_rx = 1;
+ }
}
-
if (dev->data->scattered_rx)
- rxq->rx_buf_size = data_size;
+ rxq->rx_buf_size = bufsz + QEDE_ETH_OVERHEAD;
else
- rxq->rx_buf_size = pkt_len + QEDE_ETH_OVERHEAD;
-
- qdev->mtu = pkt_len;
+ rxq->rx_buf_size = qdev->mtu + QEDE_ETH_OVERHEAD;
+ /* Align to cache-line size if needed */
+ rxq->rx_buf_size = QEDE_CEIL_TO_CACHE_LINE_SIZE(rxq->rx_buf_size);
- DP_INFO(edev, "MTU = %u ; RX buffer = %u\n",
- qdev->mtu, rxq->rx_buf_size);
-
- if (pkt_len > ETHER_MAX_LEN) {
- dev->data->dev_conf.rxmode.jumbo_frame = 1;
- DP_NOTICE(edev, false, "jumbo frame enabled\n");
- } else {
- dev->data->dev_conf.rxmode.jumbo_frame = 0;
- }
+ DP_INFO(edev, "mtu %u mbufsz %u bd_max_bytes %u scatter_mode %d\n",
+ qdev->mtu, bufsz, rxq->rx_buf_size, dev->data->scattered_rx);
/* Allocate the parallel driver ring for Rx buffers */
size = sizeof(*rxq->sw_rx_ring) * rxq->nb_rx_desc;
@@ -51,14 +51,21 @@
((flags) & (PARSING_AND_ERR_FLAGS_TUNNEL8021QTAGEXIST_MASK \
<< PARSING_AND_ERR_FLAGS_TUNNEL8021QTAGEXIST_SHIFT))
+#define QEDE_MIN_RX_BUFF_SIZE (1024)
+#define QEDE_VLAN_TAG_SIZE (4)
+#define QEDE_LLC_SNAP_HDR_LEN (8)
+
/* Max supported alignment is 256 (8 shift)
* minimal alignment shift 6 is optimal for 57xxx HW performance
*/
#define QEDE_L1_CACHE_SHIFT 6
#define QEDE_RX_ALIGN_SHIFT (RTE_MAX(6, RTE_MIN(8, QEDE_L1_CACHE_SHIFT)))
#define QEDE_FW_RX_ALIGN_END (1UL << QEDE_RX_ALIGN_SHIFT)
-
-#define QEDE_ETH_OVERHEAD (ETHER_HDR_LEN + 8 + 8 + QEDE_FW_RX_ALIGN_END)
+#define QEDE_CEIL_TO_CACHE_LINE_SIZE(n) (((n) + (QEDE_FW_RX_ALIGN_END - 1)) & \
+ ~(QEDE_FW_RX_ALIGN_END - 1))
+/* Note: QEDE_LLC_SNAP_HDR_LEN is optional */
+#define QEDE_ETH_OVERHEAD ((ETHER_HDR_LEN) + ((2 * QEDE_VLAN_TAG_SIZE)) \
+ + (QEDE_LLC_SNAP_HDR_LEN))
#define QEDE_RSS_OFFLOAD_ALL (ETH_RSS_IPV4 |\
ETH_RSS_NONFRAG_IPV4_TCP |\